67528997 has 4 divisors (see below), whose sum is σ = 67959276. Its totient is φ = 67098720.

The previous prime is 67528991. The next prime is 67529047. The reversal of 67528997 is 79982576.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36012001 + 31516996 = 6001^2 + 5614^2 .

It is a cyclic number.

It is not a de Polignac number, because 67528997 - 2⁶ = 67528933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67528991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214904 + ... + 215217.

It is an arithmetic number, because the mean of its divisors is an integer number (16989819).

Almost surely, 2^67528997 is an apocalyptic number.

It is an amenable number.

67528997 is a deficient number, since it is larger than the sum of its proper divisors (430279).

67528997 is a wasteful number, since it uses less digits than its factorization.

67528997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430278.

The product of its digits is 1905120, while the sum is 53.

The square root of 67528997 is about 8217.6028743180. The cubic root of 67528997 is about 407.2209378222.

The spelling of 67528997 in words is "sixty-seven million, five hundred twenty-eight thousand, nine hundred ninety-seven".